Tap that build number about five times quickly, and you will see a small dialog, which informs you that you have become a developer. 
Look through that section, until you see the build number. Open the settings menu on your phone, and then find the “ about” section. Most people don’t have much need of them, but those who like to really dwell in the settings of their smartphone to make the best use of it would understand. These developer options are hidden by default, by they are easy to unhide as well. One of these two methods is most likely to work. However, if the above method doesn’t’ work, then it is best to reinstall the adb and the USB drivers. On your screen, an authorization message will show, and you have to allow the connection. Open the command window and enter the command “ abd devices”. You will find this file in the user directory, which is usually in the C folder. Go to your PC, and delete the “ add key” file. On your device, us the “ Revoke USB debugging authorization, which you will find in “ Developer Options”. Open the in-command window, and type “ adb kill-server”. First, disconnect the USB and PC from each other. When Revoke USB Authorization is not working, then there are some simple steps that a user can follow: 
Server-only means that you can share local peripherals (USB devices) from your Android phone, but remote access from the same Android device to any other shared equipment won’t work.How to adb debug when “Revoke Usb Authorisation” not working? Please note: FlexiHub is a server-only solution. Just like a computer-to-computer setup, you can share a USB device connected to your mobile device with a desktop computer. FlexiHub enables USB peripheral sharing with a remote android device. Remote USB makes Android remote access easy. Fortunately, it's easy to access android phones from PC remotely. Or maybe you have a lot of text to type and or you just need a larger screen with which to work. Perhaps you are at work and happen to leave your phone with valuable data at home, and the only way to retrieve it would be connect the device remotely. Maybe your phone is one that is not easily accessible, connected to a computer in a different room, or you require the help of a specialist to fix your phone remotely. It's not too difficult to imagine the possibility of remotely accessing your Android device right from your computer.
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